6 week ultrasound

EB

Hello all, new to this process as my first pregnancy resulted in a miscarriage at 5 weeks but I never really felt any pregnancy symptoms to begin with, just a missed period. Anyways I'm guessing with my history my doctor wanted me to come in sooner for an ultrasound probably to make sure things were happening but all we saw was the gestational sac and yolk. Im feeling very overwhelmed and sad because I was really hoping to hear a heart beat. I thought I was 6 weeks 3 days but the ultrasound tech said I was measuring a little under 6 weeks actually. Is this normal? She wasn't very informational and just scheduled me to come back in two weeks and sent me on my way.. now i have to patiently wait two weeks 😔 im feeling good, my boobs are killing me, frequent urination, extremely tired a little crampy (have been from the start) and my husband and I are so excited to start our family.